Piety does not consist in isolated acts, in sporadic, ephemeral experience, nor is it limited to a single stratum of the soul. Although it manifests itself in particular acts, it is beyond the distinctions between intellect and emotion, will and action. Its source seems to lie deeper than the reach of reason and to range wider than consciousness. While it reveals itself in single attitudes such as devotion, reverence, or the desire to serve, its essential forces lie in a stratum of the soul far deeper than the orbit of any of these. It is something unremitting, persistent, unchanging in the soul, a perpetual inner attitude of the whole man. Like a breeze in the atmosphere, it runs as a drift through all the deeds, utterances, and thoughts; it is a tenor of life betraying itself in each trait of character, each mode of action.
— Abraham Joshua Heschel, Moral Grandeur and Spiritual Audacity by Abraham Joshua Heschel, Susannah Heschel, editor